Climate Warming and Land Greening up form 34-year Satellite Data?

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Monday, 5 January 2015
Felix Kogan, NOAA, College Park, MD

The past 30 years of environmental observations showed considerable impacts of global warming on snow and ice cover, sea level, biological systems processes timing (plants, birds etc) and others. It was also shown with 20-year satellite records that Earth vegetation has an early greening, especially in the northern latitudes. Currently, fourteen more years were added to the satellite records requiring re-evaluation of vegetation trends. NOAA/NESDIS has recently updated, corrected and reprocessed long-term satellite records produced from AVHRR data. These innovations permitted to develop the new 34-year Global Vegetation Health (GVH) dataset and products. This paper investigates the 34-year global, latitudinal and regional no-noise NDVI time series, characterizing land cover for the purpose of trend detection. Data showed that some regions experience greening up of land cover (in the far north of the Northern Hemisphere) but some do not show such trend, specifically in southern Hemisphere. Moreover, seasonal dynamics of NDVI in the world is different than the annual dynamics.